Mercedes M271 1.8 petrol: timing chain, tensioner and camshaft adjuster wear
Two independent German sources describe timing chain elongation on the M271 four-cylinder petrol engine (built 2002 to 2015), with a cold-start rattle, a worn tensioner and worn camshaft adjusters, and in the worst case a chain that jumps and damages the engine. One says older cars without the EVO optimisation are more affected; the other says the chain remained an issue on the EVO as well. The earlier checklist item named the balance shaft; none of the sources used here mentions it.
Dossier revision 1 · data updated 2026-10-13 · canon release 2026.10.1
At a glance
- Severity
- Major risk of being immobilised, or replacement of a major component.
Severity follows the worst documented outcome, not the average case. - Safety-relevant
- Not flagged as safety-relevant.
- In the Elgarde checklist
- Ordinary entry: it does not cap the verdict by itself.
- Documented in
- EU
Which cars this covers
Only Mercedes four-cylinder petrol engines of the M271 family (1,796 cc), built 2002 to 2015 according to the sources: the supercharged versions and the later turbocharged EVO versions. The sources say cars without the EVO changes are more affected. Mercedes V6 and V8 engines (M272, M273) are not part of this entry.
- Models in scope
- Mercedes-Benz C-Class, Mercedes-Benz E-Class, Mercedes-Benz SLK
- Conditions on top of the model
- All of these must hold:
- Engine: Mercedes M271 1.8 petrol (supercharged and EVO)
- Production date: January 2002 to December 2015
- All of these must hold:
- Notes on scope
- The legacy checklist item for this engine named a balance shaft; this entry covers the timing chain, which is what the sources describe. Engine sub-codes and the exact date of the EVO change are not given in the sources used. One source says the M271 was also used in other, lower-volume Mercedes models without naming them, so the model list may be incomplete. The only sources are two independent specialist articles; no manufacturer document, recall, regulator record or failure rate was found.
How to check whether a particular car is affected
Elgarde reads the conditions above and gives one of three answers for a car:
- Applies: every condition is confirmed for the car.
- Possible: at least one condition cannot be confirmed yet. The entry stays on the checklist, with a note on what to find out.
- Not applicable: a condition is clearly not met (for example a manual gearbox on a DSG entry). The entry is left off the checklist.
What to look for, and where
- Model: one of the models listed above
The model name as on the registration document, e.g. Golf, 208, 320d. - Engine code: Mercedes M271 1.8 petrol (supercharged and EVO)
On the engine plate or block, or from a dealer VIN query. Displacement (P.1) and power in kW (P.2) on the registration certificate help narrow it down. - Production month: January 2002 to December 2015
The month the car was built (on the VIN plate or in the registration papers). It only matters when the year alone does not settle it.
When in doubt, treat the car as possible: asking one question too many costs less than missing a defect.
How the fault arises, as reported
The M271 uses a single-row (simplex) timing chain. Gebrauchtwagenberater.de gives a defective chain tensioner as the usual cause of early elongation, with wear accelerated by late or missed oil changes, and says the camshaft adjuster sprockets can wear so that the chain jumps; mbpassion.de names wear of the chain and tensioner, says a worn tensioner can in the worst case let the chain jump, and that the camshaft adjusters wear with a worn chain, which raises the risk of engine damage. According to Gebrauchtwagenberater.de the EVO versions from 2009 changed to a toothed chain; mbpassion.de describes the earlier cars as more affected, while Gebrauchtwagenberater.de says the chain stayed an issue on the EVO. No Mercedes document on these changes was found.
Reported symptoms
Early signs
- Rattling from the front of the engine at cold start and under load changes
Later signs
- Chain jumping a tooth after a worn tensioner or adjusters, with possible engine damage
What to check when inspecting a car
- Documents and records. Confirm the engine is an M271 and the build date; ask whether the timing chain, tensioner, guides and camshaft adjusters were ever replaced, and ask for the oil-change history.Red flag: No chain work on record and late or missed oil changes.
- Listen. Start the engine fully cold and listen at the front of the engine for a metallic rattle, then listen again under changing load.Red flag: Rattle: have a specialist measure the chain elongation before buying.
- Diagnostic read-out. Read the fault memory for camshaft timing correlation faults; Gebrauchtwagenberater.de says the manufacturer offers a check of chain elongation with a measuring chain tensioner.Red flag: Camshaft timing faults stored.
Repair and cost
- Usual remedy
- Replacement of the timing chain together with the tensioner, guides and camshaft adjusters, as the sources advise replacing them together. No cost figure is given in the sources used here.
- No published repair cost is recorded in this dossier.
What the manufacturer and regulators have said
No manufacturer programme, recall or regulator record is recorded for this entry in the sources used.
How common is it?
No reliable figure
No reliable figure for how many cars are affected is recorded for this entry. This is stated on purpose: a missing number is not a low number.
No verified share of M271 engines with timing chain wear has been published; the two articles used give no failure percentage (mbpassion.de says many engines show elongation before 100,000 km, without a number). Sources: [1], [2]
Evidence and sources
Each statement above traces to the sources below. Review status is shown for every source.
| Publisher | Title | Date | Type | Tier | Confidence | Links | Review |
|---|---|---|---|---|---|---|---|
| Gebrauchtwagenberater.de | [1] Mercedes M271 Probleme und Schwachstellen German used-car guide: M271 (1,796 cc four-cylinder, built 2002 to 2015; EVO versions from 2009). The chain was changed from duplex to simplex; the simplex chain is known for early elongation that can lead to major engine damage; the guide gives a defective chain tensioner as the cause, with wear accelerated by late or missed oil changes. Symptoms: rattling at cold start and under load changes; camshaft adjuster sprockets can wear and let the chain jump, so the guide advises replacing them with the chain. On the EVO (toothed chain instead of roller chain) it says the chain remained an issue. No failure percentage, balance-shaft or manufacturer-programme information is given. | 2026-08-17 | Specialist press | 2 · press or analysis | medium | gebrauchtwagenberater.de opened 2026-10-13 Archive copy | automated source check 2026-10-13 |
| mbpassion.de | [2] Mercedes M271 Motor: Probleme, Schwachstellen und Tipps für Gebrauchtwagenkäufer German Mercedes enthusiast magazine: M271 built 2002 to 2015 in the C-Class, E-Class and SLK. Rattling at cold start; many engines develop chain elongation before 100,000 km; the cause is wear of the chain and tensioner, and older models without the EVO optimisation, which have the simple simplex chain, are said to be more affected; a worn tensioner can in the worst case let the chain jump. Camshaft adjusters wear with a worn chain, which raises the risk of engine damage. The article does not mention a balance shaft or a manufacturer programme. | 2026-02-08 | Specialist press | 2 · press or analysis | medium | mbpassion.de opened 2026-10-13 Archive copy | automated source check 2026-10-13 |
Automated source check: the source was opened and its claims, dates and figures were compared with this dossier by an automated check. It is not a human sign-off.
Reuse, attribution and corrections
Text and data: Elgarde, licensed under CC-BY-4.0, canon release 2026.10.1. Credit “Elgarde”, link to this page and say if you changed the text.
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Suggested citation
Elgarde, “Mercedes M271 1.8 petrol: timing chain, tensioner and camshaft adjuster wear”, known-defect dossier m271.timingchain, canon release 2026.10.1, CC-BY-4.0, https://elgarde.com/defects/m271.timingchain/
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